From the Regina perspective, I can't give you exact figures on door-to-door delivery, but I can tell you about my experience within the city, as a resident.
All new divisions within the City of Regina are designed with the concept of the community mailbox, and with the past years of tremendous growth around the city, you would have seen a number of those locations created.
I live in a portion of the city in an older neighbourhood that was built in the 1970s. If Canada Post came to the city and wanted to put a community mailbox in my neighbourhood, then there probably would be the planning provisions for that to occur from an urban design perspective.
There are other neighbourhoods within the city—Cathedral is a prime example that people from Regina would know—where from an urban planning perspective it would be extremely challenging to put in a community mailbox.